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September 18th, 2025 :: 8:51 am CDT   

Local Weather Report for
Decatur
Illinois, United States

 Current Decatur Weather Conditions Updated September 18th at 7:54 am 
Temperature:63°F Dew Point:30°F
Barometer:30.06 inHg Wind:calm
Humidity:29.3% Visibility:0M
 
 Decatur Weather Forecast Summary  
 
Today
Sep 18th
Friday
Sep 19th
Saturday
Sep 20th
Sunday
Sep 21st
Monday
Sep 22nd
Mix of Cloud and Sun Cloudy Cloudy Showers Thundershowers
93°F
87°F
64°F
89°F
65°F
90°F
66°F
87°F
65°F
 
 Decatur Detailed Weather Forecast  
 
Thursday, September 18th, 2025
Morning Temperature: 85°F
Sunny.
Afternoon Temperature: 86°F
Sunny.
Evening Temperature: 69°F
A mix of cloudy and clear skies.
Friday, September 19th, 2025
Overnight Temperature: 65°F
Cloudy.
Morning Temperature: 83°F
Cloudy.
Afternoon Temperature: 82°F
Cloudy with a slight chance of showers or thundershowers.
Evening Temperature: 71°F
Cloudy with a chance of showers. Slight chance of a thunderstorm.
Saturday, September 20th, 2025
Overnight Temperature: 67°F
A mix of cloudy and clear skies.
Morning Temperature: 82°F
Sunny. Slight chance of a thunderstorm.
Afternoon Temperature: 83°F
Cloudy. Slight chance of a thunderstorm.
Evening Temperature: 72°F
Cloudy.
Sunday, September 21st, 2025
Overnight Temperature: 67°F
Cloudy.
Morning Temperature: 86°F
Cloudy. Slight chance of a thunderstorm. Windy at times.
Afternoon Temperature: 73°F
Cloudy with a chance of showers. Slight chance of a thunderstorm. Windy at times.
Evening Temperature: 69°F
Cloudy with showers likely. Windy at times.
Monday, September 22nd, 2025
Overnight Temperature: 65°F
Cloudy with a few showers.
Morning Temperature: 76°F
Cloudy with a chance of showers or thundershowers. Windy.
Afternoon Temperature: 77°F
Cloudy with a few showers. Chance of a thunderstorm.
Evening Temperature: 66°F
Cloudy with a chance of showers. Windy at times.
Tuesday, September 23rd, 2025
Overnight Temperature: 66°F
Cloudy. Windy at times.
Morning Temperature: 78°F
Cloudy. Chance of a thunderstorm. Windy at times.
Afternoon Temperature: 81°F
Cloudy. Chance of a thunderstorm. Windy at times.
Evening Temperature: 66°F
Cloudy with showers likely.
Wednesday, September 24th, 2025
Overnight Temperature: 65°F
Cloudy with a few showers. Slight chance of a thunderstorm. Windy at times.
Morning Temperature: 64°F
Cloudy with periods of rain.
Afternoon Temperature: 64°F
Cloudy with a chance of showers.
Evening Temperature: 57°F
A mix of cloudy and clear skies.
Thursday, September 25th, 2025
Overnight Temperature: 56°F
Cloudy with a slight chance of showers.
Morning Temperature: 67°F
A mix of cloud and sun. Windy at times.
Afternoon Temperature: 67°F
Cloudy with a chance of showers. Windy at times.
Evening Temperature: 59°F
Cloudy with clear periods with showers likely. Windy at times.
Friday, September 26th, 2025
Overnight Temperature: 56°F
Clear with cloudy periods. Windy at times.
Morning Temperature: 65°F
Sunny with cloudy periods. Windy at times.
Afternoon Temperature: 70°F
A mix of cloud and sun.
Evening Temperature: 61°F
Cloudy.





 

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This WeatherCity Weather Forecast for Decatur, Illinois, United States is computed using a computer-generated forecast model and should be considered experimental. Please confirm this weather information with your official weather information office

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